Journal
JOURNAL OF LIGHTWAVE TECHNOLOGY
Volume 33, Issue 12, Pages 2499-2503Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JLT.2014.2382675
Keywords
Fabry-Perot interferometer; fiber Bragg grating; fiber sensor
Funding
- KAKENHI-JSPS [2360379]
- Grants-in-Aid for Scientific Research [25820176] Funding Source: KAKEN
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A fiber Bragg grating (FBG) has been used as a sensor head for the measurement of temperature and static strain. However, a standard FBG sensor, which is constructed on a single-mode fiber, cannot work well under conditions where both the temperature and strain change independently since the sensor has cross-sensitivity between them. The cross-sensitivity problem can be solved by using an FBG constructed on a polarization maintaining fiber (PM-FBG) instead of a standard FBG. In this paper, we report improvement on the resolution for the simultaneous measurement of temperature and static strain. A Fabry-Perot interferometer constructed with PM-FBGs (PM-FBG-FPI) is introduced as a sensor head. The fine structure of a PM-FBG-FPI reflection spectrum enables high-resolution detection of wavelength shifts. The resulting high-resolution measurements are demonstrated experimentally.
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